Adjustable knobs allow for tool free adjustment 5/16 7/16 inches for solid hardwood and 1/2 5/8 inches for engineered hardwood and engineered bamboo.. Over molded rubber grip for comfort and maneuverability. Muffled rear exhaust to direct air away from workspace. Non Marring trip tips so you don't accidentally damage the flooring. Easy sight tongue engagement so you hit the pocket every time. .